[PATCH 4.7 07/45] b43: fix debugfs crash

[Greg Kroah-Hartman]

4.7-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Christian Lamparter <chunk...@googlemail.com>

commit 51b275a6fe5601834b717351d6cbdb89bd1f308b upstream.

This patch fixes a crash that happens because b43's
debugfs code expects file->f_op to be a pointer to
its own b43_debugfs_fops struct. This is no longer
the case since commit 9fd4dcece43a
("debugfs: prevent access to possibly dead file_operations at file open")

Reviewed-by: Nicolai Stange <nicsta...@gmail.com>
Signed-off-by: Christian Lamparter <chunk...@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 drivers/net/wireless/broadcom/b43/debugfs.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/net/wireless/broadcom/b43/debugfs.c
+++ b/drivers/net/wireless/broadcom/b43/debugfs.c
@@ -524,7 +524,8 @@ static ssize_t b43_debugfs_read(struct f
                goto out_unlock;
        }
 
-       dfops = container_of(file->f_op, struct b43_debugfs_fops, fops);
+       dfops = container_of(debugfs_real_fops(file),
+                            struct b43_debugfs_fops, fops);
        if (!dfops->read) {
                err = -ENOSYS;
                goto out_unlock;
@@ -585,7 +586,8 @@ static ssize_t b43_debugfs_write(struct
                goto out_unlock;
        }
 
-       dfops = container_of(file->f_op, struct b43_debugfs_fops, fops);
+       dfops = container_of(debugfs_real_fops(file),
+                            struct b43_debugfs_fops, fops);
        if (!dfops->write) {
                err = -ENOSYS;
                goto out_unlock;